Appearance is taking too long to load. proceeding with world generation...

I use Minecraft Education in schools. I am currently using Minecraft Education V 1.20.13 on Windows 11, Mac OS 13, and iOS 17.

One of the topics we use it for is the Titanic, which is on the school curriculum. I have a Titanic World, which contains a scale model of the Titanic that used a custom resource pack to change the look of some of the blocks.

Recently, while trying to load into the Titanic world, the message “appearance is taking too long to load. proceeding with world generation...” displays and the app freezes, and I must force quit the app. However, the world will load if I disable the resource pack. I have also experienced the same thing when trying to open the Titanic world in the latest version of Minecraft Bedrock edition.

I have been unable to find a solution to this issue.

Can anyone suggest a fix?

Thanks for your help.